But given my own understanding of it, since you are using your own artwork, there is no issue regarding the image and it cannot be classed either as copyright or plagarism. So your perfectly safe with using that image as it bares no similarity to the origional.

As for the wording , since it has become a quote in the public domain with no origional author for it cited, or found, it has become part of commen knowledge, and therefore is not subject to copyright law. However... if you were to change it to something like "Epic Boobs, can turn a straight woman gay in 0.5 seconds", that is a completely origional line and so is not subject to copyright or plagerism of any kind.

Its the same reasons why The Simpsons couldn't sue Family Guy for instance, even though they plagerised the idea of it from them as it was origional artwork and wording.

Hope that helps, and Giz, your free to use my altered quote. I won't do you for copyright. lol ;)